"if you want to do it, all you have to do is do it."

You may or may not have heard, but I am going to run a marathon.
That is 26.2 miles.

Sometimes I when I think about it I get really excited.
Sometimes I get sick thinking about it.

But mostly, I know I can do it.  
Because of people like this:

I posted this on facebook a couple of months ago after reading about this guy in Runner's World magazine.  Even though I've seen it several times, I still find it completely inspiring.  

Especially that last line.